JAPSPEED 40mm ALLOY RADIATOR RAD FOR SUBARU IMPREZA NEWAGE GDA GDB WRX STI 03-06. Our all aluminium, lightweight performance radiators allow for much greater cooling in demanding conditions in comparison to OEM items. A must-have item for spirited driving, this 30mm radiator will keep your coolant temperature down no matter how hard you are pushing thanks to a 30% increase in cooling capability over the standard unit. Large 40mm high-flow aluminium core Up to 30% greater cooling capability over OEM Manufactured from aerospace grade aluminium. We only use reputable couriers such as DHL/Yodel and TNT to ensure your order is delivered on time; at a time to suit you.